Optically excited spin dynamics of thermally metastable skyrmions in Fe0.75Co0.25Si

authored by: J. Kalin, S. Sievers, H. Füser, H. W. Schumacher, M. Bieler, F. García-Sánchez, A. Bauer, C. Pfleiderer
Abstract: We investigate the microwave spin excitations of the cubic chiral magnet Fe0.75Co0.25Si as driven by the thermal modulation of magnetic interactions via laser heating and probed by time-resolved measurements of the magneto-optical Kerr effect. Focusing on the topologically nontrivial skyrmion lattice state, the dynamic properties in thermodynamic equilibrium are compared with those of a metastable state prepared by means of rapid field cooling. In both cases, we find precessional and exponential contributions to the dynamic response, characteristic of a breathing mode and energy dissipation, respectively. When taking into account the universal scaling as a function of temperature, the precession frequencies in the equilibrium and metastable skyrmion state are in excellent quantitative agreement. This finding highlights that skyrmion states far from thermal equilibrium promise great flexibility, for instance, with respect to temperature and field scales, both for possible microwave applications and for the study of fundamental properties.
External Organisation(s): National Metrology Institute of Germany (PTB)
Technical University of Munich (TUM)
Type: Article
Journal: Physical Review B
Volume: 106
ISSN: 2469-9950
Publication date: 24.08.2022
Publication status: Published
Peer reviewed: Yes
ASJC Scopus subject areas: Electronic, Optical and Magnetic Materials, Condensed Matter Physics
Electronic version(s): https://doi.org/10.1103/PhysRevB.106.054430 (Access: Open)
https://link.aps.org/doi/10.1103/PhysRevB.106.054430 (Access: Unknown)

BibTeX

@article{85205b241eb8447fb06f0d022888dca1,
title = "Optically excited spin dynamics of thermally metastable skyrmions in Fe0.75Co0.25Si",
abstract = "We investigate the microwave spin excitations of the cubic chiral magnet Fe0.75Co0.25Si as driven by the thermal modulation of magnetic interactions via laser heating and probed by time-resolved measurements of the magneto-optical Kerr effect. Focusing on the topologically nontrivial skyrmion lattice state, the dynamic properties in thermodynamic equilibrium are compared with those of a metastable state prepared by means of rapid field cooling. In both cases, we find precessional and exponential contributions to the dynamic response, characteristic of a breathing mode and energy dissipation, respectively. When taking into account the universal scaling as a function of temperature, the precession frequencies in the equilibrium and metastable skyrmion state are in excellent quantitative agreement. This finding highlights that skyrmion states far from thermal equilibrium promise great flexibility, for instance, with respect to temperature and field scales, both for possible microwave applications and for the study of fundamental properties.",
author = "J. Kalin and S. Sievers and H. F{\"u}ser and Schumacher, {H. W.} and M. Bieler and F. Garc{\'i}a-S{\'a}nchez and A. Bauer and C. Pfleiderer",
note = "Publisher Copyright: {\textcopyright} 2022 American Physical Society.",
year = "2022",
month = aug,
day = "24",
doi = "10.1103/PhysRevB.106.054430",
language = "English",
volume = "106",
journal = "Physical Review B",
issn = "2469-9950",
publisher = "American Institute of Physics",
number = "5",
}